Bevel Gearing. 519 nre machine-moulded by two half-patterns, and work smoothly if well formed; being said to be stronger than ordinary teeth, •u-hich is doubtful. (4.) Bevel Gearing connects shafts whose directions meet .at any angle. Their ideal form is that of the frustra of cones, .as A and B, Fig. 512, having a common vertex, as c. The pitch -diameters are measured at d d S/3. Two shafts A and B, Fig. 513, are to be connected so that their revolutions shall be as 2:1. Assume any convenient -diameter c 3> and draw c K and i> M |[ to A L. Taking E F « 2 c D, draw E H and FG f| to BL. Through G draw GH at right angles to B L, and G K at right angles to AL : then join H, G, and K to L.